Development of ac Calorimetric Method for Thermal Diffusivity Measurement III. Heat Loss in the Measurement of Fine Wires

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Abstract
The measurement of the thermal diffusivity of a fine wire is developed, using a light-irradiation-type ac calorimetric method. It is pointed out that in the analysis, the contribution of heat loss or external relaxation time should be taken into account for the measurement of a fine wire. To examine the measurement, a wire of stainless steel with a diameter of 30 µm is used as a sample and the test is carried out in the wide frequency range of 1–25 Hz. The result obtained agrees with the value reported for the bulk material.